Tool holder



April 10, 1934'. R. K. JEFFREY TOOL HOLDER Original Filed Sept. 24. 1930 /N vEN'roR Rober-7 K. Je ffr'ey ATT 'YS Patenteci Apr. 10, 1934 i 'ishte TOOL Hon-cna Robert K. Jeff'ey, Coiunhns, Ohio, assignorto The Jefrey Manuf-ctnring Company, a corporation of Ohio Original application 24, 1930, Serial Divide&

and this appiication March-19, 1932, Serial Ne. 559365 4 cmime (ci. 279-79 My invention relates to tool hoiders of` the type adapted to receive and hold in working sition, augers for drilling in coai veins adapted to receive biasting charges. Another object of the invention, is the prcvi sion of improved and efhcient mechansm for reieasably locking an Operating shaft to a tool hoider. Other objects of the invention will appear here ing set forth in the ciaims hereto appended.

The present application is a division of my copending application, Serial Number &84,190, filed September 24, 1930, for an Improvement in driil mechanisn. r

An illustrative embodiment of the inventi n is shown in the accompanying drawing, in which:

Fig. l is an eievationai View of a tool haider embodying my invention. i

Fig. 2 is a sectionai eievation of the interier Construction of the tool hoider shown in Figgl.

Fig. 3 is a'plan View of the structure shown in Fig'. 1.

Fig. 4 is a cross-sectional View taken on the line 4-4 of Fig. 3, looking in the direction of the arrows.

Fig. 5 is a sectional elevationai View of a modification.

Fig. 6 is a sectionai view taken on the 6-6, Fig. 5, looking in the direction of the arrows.

By referring to Fig. 1, it will be seen that the anger, or drilling bit 15, is detachaby held by socket 16 fixed to the end of a feed screw 17, which is operatively connected to power transmission mechanism.

The socket 16 may be connected to the feed screw 17 permanently, by means of the rivets 18, so that such socket will rotate at all times with the feed screw 17.

The drili socket proper, designated 19, is provided with a rectangular recess, or opening 20, extending axially of the feed screw 17 and being adapted to receive the fiat shank 21 of the drili 15.

Extending transversely through the socket 19 is a semi-circular recess 22, which is adapted to register with a transverse semi-circuiar or semicylindrical recess 24, in the fiat shani: 21, as shown in Fig. 2.

Extending into the seni-cylindrical recesses 22, 24, is a transverse rotatable key 25, which is operatively connected to the knob 26, as shown in Figs. 1, 3 and 4.

As shown in Fig. 4, the key 25 may be provided at its ends with cyiindrical extensions 27 and inafter, the novei features and combinations ice-` I recess 22.

jcurnaled in hea'ings 29, 30 of the societ 19.

,e crosspin 31, extending through the cylinm niher 27, is adapted to fit in recesses one side of the socket 19.

At'ti'e other of the socket 19, a spring is irterposed between the knob 26 and the socket 19, By pressing the kno'b 26 against the socket 19, the pin 31 may he reieased to permit turning c 25 from its looking position, shown in s. 2 and 4, to its uniocking position, to permit withdrawai of the tool shank 21. When a new tool iinserted into the socket 19, it may be icched in position when the transverse recess 24 in the shani; thereoi', registers with the transverse Then the knob 26 may be turned to place the key 25 in the recess 24. The spring 33 holds the 'pin 31 in the recess 32 during operation of the drili,

in the modification shown in Fg. the driil 15' is provided with a tapering fiat-sided shank 21', which may he Secured permanentiy hy means of 'the ritet 34 to the driii socket 16".

The feed screw 17' is detachably connected to the seciret 19' by means of the structure'shown in Figs. 5 and 6. Near the end of the feed screw 17' at one side thereof, is located a cyiindrieai recess 35 for receiving the ey'iindricai looking pin 36, which extends through an opening in the wall of the socket 19'.

As shown in Fig. 6, the socket 19' with longitudinai splines 37, 37, which may be integral with the socket 19'. The splines 37, 37, are adapted to fit into grooves 38, 38, which extend longitudinally of the feed screw 17' diametrically opposte each other. It will thus be seen that when the recess 35 in the feed screw 17' registers with the opening in the wall of the socket 19', the pin 36 may be inserted into the recess 35 to lock the tool holder against 1ongitudinal movement away from the feed screw 17'. While the pin 36 fttng into the recess 35 may, in some instances, be sufiiciert to connect the tool holder to the feed screw for the purpose of imparting rotary movement from the feed screw to the tool holder, I prefer to reenforce such connection by means of the iongitudinal spiines 37, 37, fitting into the longitudinai grooves 38, 38, in the feed screw 17'. Furthermore, by providing splines to fit into such grooves, the registration of the recess 35 with the opening 39 in the socket 19', may be more quickly effected.

Rigidly Secured to the pin 36 is the ring 40 against the inner'surface of which, bears a spring 41. Intermediate the ends of the spring 41 is an elbow 42 adapted to fit into a recess 43 in that is provided side of the socket 19' diametrically opposite the pin 36. It can readily be seen by refer'ing to Fig. 6, that the spring 41 acts to hold the pin 36 in the recess 35, but by pressing the ring upwardly, the pin 36 may be released from the recess 35, so that the socket 19' may be pulled off the feed screw 17'.

Lugs 44 and 45 may be provided on the socket 19', as shown in Figs. 5 and 6, to receive the ring 40 between them and thus prevent longitudinal movement of the ring. By the use of the lugs 44 and 45, the pin 36 may be formed separately from the ring. In other Words, the pin 36 need not be Secured to the ring 40, when the lugs 44 and 45 are provided to hold the ring 40 against longitudinal movement relatively of the socket 19'. consequently, if repeated operations of the drill, by reason of the thrust action on the pin 36, wear out this pin, it may be renewed without renewing the ring 40.

Obviously, those skilled in the art, may make various changes in the details and arrangement of parts, without departing from the spirit and scope of the invention, as defined by the claims hereto appended, and I wish, therefore, not to be restricted to the p'ecise Construction herein disclosed.

Having thus shown and described an embodiment of my invention, what I desire to have .protected by Letters Patent of the United States is:

1. In apparatus of the class described, the combination with a longitudinally displaceable shaft, of an auger supporting member having a socket portion adapted to receive one end of said shaft, said shaft having a recess in registry with an aperture in the wall of said socket portion, a loop-shaped member loosely surrounding the socket portion, a pin fixed to said loop-shaped member and engageable in said recess, and spring means interposed between the socket portion and the loop-shaped member opposite the pin and substantially within said loop-shaped member whereby the latter is yieldingly retainable in said recess, forced yielding of the spring permitting disengagement of the pin from the recess. 2. In apparatus of the class described, the combination with a longitudinall y displaceable shaft, of an auger supporting member having a socket portion adapted to receive one end of said shat, said shaft having a recess in registry with an aperture in the wall of said socket portion, a loopshaped member loosely surrounding the socket portion, a pin fixed to said loop-shaped member and engageable in said recess, and spring means interposed between the socket portion and the l'oop-shaped member opposite the pin whereby the latter is yieldingly retainable in said recess, the spring means being in the form of a leaf spring disposed as a chord of said loop-shaped member, forced yielding of the spring permitting disengagement of the pin from the recess.

3. In apparatus of the class described, the combination with a longitudinally displaceable shaft, of an auger supporting member having a socket portion adapted to receive one end of said shaft, said shaft having a recess in registry with an aperture in the wall of said socket portion, a loop-shaped member loosely surrounding the socket portion, a pin fixed to said loop-shaped member and engageable in said recess, and spring means interposed between the socket portion and the loop-shaped member opposite the pin Whereby the latter is yieldingly retainable in said recess, the spring means being in the form of a leaf spring disposed as a chord of said loopshaped member and having a central portion projecting into a recess in said socket portion, forced yielding of the spring permitting disengagement of the pin from the recess.

4. A torque and thrust transmitting means for connecting a tool to the end of a reciprocable threaded and longitudinaliy grooved feed shaft of a drill, said means having a cyiindrical socket of a size to receive slidingly a substantial length of the shaft end and provided with an internal spline for engagement with the shaft groove for the transmission of torque, the socket having an end wall against which the extremity of the shaft abuts for the transmission of feeding thrust, and releasable latch means carried by said connecting means and adapted to engage the shaft end for the transmission of withdrawal thrust.

ROBERT K. JEFFREY. 

